Millstone



Sept 21 1943. M, MACEK, SR, ETAL Q MILLSTONE Filed Dec. 26, 1941 2 Sheets-Sheet 1 INVENTORJ- A1477 MACE/f, J: BY c/l ATTO/P/VEX sept 21, 19 3 M. MACEK, s11, ETAL MILLSTONE V Filed Dec. 26, 1941 2 Sheets-Sheet 2 INVENTOR. M477 M46271, 5A.

WLI. N a 0 v A wardly between It is therefore a primary object of our v tion to provide. an improved grinding mill in Patented Sept. 21, 1943 UNITED STATES FATE m oFrIcE ILLs'r'oNE- Matt Macek, Sr., and Matt Macek, Jr., H Cedar Rapitls, Iowa s 1 Application December 26, 1941, Serial No. 424,422.

.4 Claims. (01. 83'7) This invention relates to grinding mills and has particular relation to improvements insuch devices for pumping or feeding material between grinding flour, meal, mustard and other com modities of this nature, stationary and rotatable milling stones are employed, and the material to be ground is fed downwardlythrough theopen centerof the upper mill stone. into a centrally disposed cavity from which cavity, it is fed outthe milling faces of milling stones. y 4

It has been our experience, particularly with mills-of relatively large size; that the weight of the upper mill stone is frequently so great that the material to be ground cannot find its way between the milling surfaces of the stones. Vari- .ous devices have been suggested for overcoming this difficulty, which devices, however, we have found to berobjectionable in themselves from an operating viewpoint. When the milling faces of the mill stones, in mills employing these devices ofthe prior art, wear downv after a period of operation, it is necessary to completely disassemble themill in order to adjust the pumping or feeding mechanism.

invenwhich means are not only provided for pumping, or feeding, the material to be ground between the grinding faces of the stones, but'in'which the pumping means may. be easily adjusted as the milling stones wear, and without dismantling the mill.

. Another primary object of our invention is the provision,fin a grinding mill, of means for great- 1y increasing the grinding capacity.

Another primary object of our invention is the provision-in agrinding -mill of means for increasing the life of operation and for facilitating service and maintenance operations. 1

Other and further features and objectsof our invention Will be more "apparent to those skilled in the art upon a consideration of the. accompanying drawings and following specifications, wherein are disclosed exemplary embodiments of the invention,.with the understanding, however, that suchchanges may be made thereinas fall within the scope of the appended claims, without departing from the spirit of the invention. In the drawings: a I

fl' figure 1 is a plan view of a grindmgmillcon} structed in accordance with a preferred embodi ment of our invention with portions thereof re- 7 moved to better illustrate thev structure.

Figure 2 is a fragmentary view in section of the grinding mill illustrated in Figure 1 and as taken onthe lines 2---2. r 'Figure 3 is aplan view of a grinding mill con- =structed,in accordance witha modified form of ouninvention. s s c Figure 4 is a vertical cross sectional view of the grinding mill illustrated.in.Figure 3 and as taken on the lines 44, and

Figure 5 is a fragmentary view partly in section illustrating one of thepumping means uti- .lized in the device of Figures 3 and 4. ,1

Referring 'now' to, the drawings and to Figures 1 and 2 in particulargrinding mills, as they are ,normally constructed, employ a lower mill stone, or bed stone, which we have indicatedin general at IB, and an upper mill stone, or runner, ll, mounted for rotation above the bed stone and driven through a spider, or driving member I 2 by means of a drive shaft, not shown, but extending upwardly throughthe center of the bedstone. The material to be ground is fed downwardly through an axially disposed opening 13 in the runner stone into a cavity I4 formed in the opposed faces of the grinding stones; In the improved mill stone shown, wejhave provided a plurality of paddle-like members It, which may be of wood or metal and which are disposed in radially spaced positions within the cavity. The pumping members are positioned so as to provide a draft which willforce the material being ground outwardly between the milling surfaces of the stones. These paddle members I6 are preferably disposed vertically in positions parallel to the axis of the grinding stones and the upper wall, oreap, I1 is slotted for their reception 'asat l 8. A recess in the form of a T-slot is also provided adjacent each slot 18 and as indicated at 19. ,Each paddle member I6 is slotted vertically ,downwardlyfrom its upper edge as atil and-a ;T bolt 22 is employed to fixedly and adjustably secure each paddle member [6 in position, Eachpaddle member maybe adjusted toany vertical position required so asto force material outwardly between the milling faces of the stones. I:I o wever, it is preferable that the lower edge of ,each'paddle be-positionedas shownin Figure 2, just/opposite theinnen edges ofthe milling surfaces IDA andI-IA... It is also preferable that the lowernedge of eachpaddle be chamfered as at 23 .(Figur,e,2;),for purposes whichwill be hereinafter described. 1 i

The inner marginal edges of the grindingfaces IDA and HA of the milling stones are provided with a plurality of V-shaped notches, as indicated at 24 and 26 respectively. The notches 26 in the upper milling surfaces are preferably disposed substantially radially opposite the outer edge of each paddle member as well as in intermediate positions between the paddle members. Thus material forced outwardly by the leading surface of each paddle and fed downwardly by the lower chamfered edge 23 of each paddle is forcedout- Wardly into the V-shaped notches 24 and 26 which provide an inclined surface over which the material to be ground may readily pass so asto enter between the closely fitted surfaces of lthe.

milling stones. The milling surfaces of the stones are preferably provided with grinding, cracks lO-B in accordance with the usual practice.

We preferably provide an annular recess 2.1:m the upper surface of the cap of the runner into which the flanged edge 28 of a cover meni'ber'ZH, of sheetmetalor the-like, may be received. .The inner edge .of the cover member, mayv also be flanged as indicated .at BI. and received in a secondannular recess 32, in order to sealzthe top surface of the upper mill-stoneand prevent the entry of any :foreignmatter through the .paddle slots. This cover member is preferably held in position by means of bolts 33 securedratitheir lower endsto the T-bo1ts 22.

It is common practice in .constructing :such grinding mills to utilize a hollow-centeriannular grinding stone'asindicated at-|l-B in Figure 2,

which stone -is. secured by cement or the dike to the flat and substantially solid upper walL-br cap stone H, which may heof concreteor :the like. '-It will be understoodthat when'the grindingpor- 'tionof the stone wears down thin it wouldbe dangerousto employsuch a stoneas the runner. However, there is no-objection to using such-a the mill stones and is discharged through the conduit 52. We prefer to provide such a grinding mill with an auxiliary conduit 53 connected with the inner cavity of the bed stone so as to make I it possible to wash or flush out the entire grinding mill when grindingunash iol llhe like, without having to remove the upper mill stone and otherwise disassemble the mill. The conduit 53 is normally closed by means of a gate-valve 54.

Grinding mills embodying our inventive idea,

as herein disclosed, are relatively simple and :inexpensive to construct, and eliminate a con- 'sidenaible amount of maintenance work necessary inlkeepingimills of the usual type in operative condition. It is possible to employ these 2li111i1lS-f0r longer periods before servicing or rebuilding becomes necessary. Furthermore, 'we have .found -.that.a.-grinding mill constructed as shown and describedds capable of handling much greater quantities -of material than mills con- ;i structecl imaocordance :with the usual ;practice.

We ,have found, furthermore, that although the capacity of such .a mill is greatly increased, .the amount of power required to operate the mill.-is actually decreased.

to Although we have describedspecific embed- ..ments of our invention, .it..is apparentthatmodifications thereof maybe-made by=those skilleddn the art. Such modifications may be made without departing from the-spirit :and scope .of -.our

35ii1iVentl0l'1 as-defin'edin the appended claims.

W eclaun as our :invention:

Lin .a grinding mill 10f, the .disk type :a bed .stone, a runnerlstone, thezsaidastones being .provided with a cavity in :theiradjoining .faces and -Worn-stone-as the bed-stona or stationai y mem- 4.0 :Speeed from their Outer edges, the :runner ber, and it will be understood that'the plate 2 9 may be employedto close all-the-openings-in the capstone topermit itto beused-as the lower mill stone without leakage.

We prefer also to secure the'milling stones'of such a grinding-mill to the capstone by means of a plurality of long bolts -34, which bolts *are installed through deepopenings ii't inthe faces of the mill stones. Thesebpenings may be sealed withcork plugs, or thelike;to permit the replaceineht of the milling stones without having -to 'tliscard the concrete cap stone, orbedstone.

The modified fomnof mill stone embodying our inventive idea and as illustrated "in Figures *3 to 5, inclusive, includes a runner 4| "and abed stone 4?, which may be constructed substantiallyas heretofore described in connection with Figures 1 and 2. The'pumping b1ades'43, howeverpare preferably constructed of sheet metal such as stainless steel, or the like, and curve rearwardly along their outer vertical edges as indicated at'M-and this curved portion of each blade, in conjunction with the draft provided each blade, for.ces the-material to-be ground outwardly against the'adjacentfaces of the milling 60 stone This ,permits the pumping members to m5 ing .aiplurality =of :slottedxopenings \extending :through :the mall thereof, paddie like :pumping :members-extending :through these :slotted copenings, isaid .pumping members 'being substantially -radiallypositioned, circumferentially spacedzand extending outwardly to the periphery :of :the

cavity.

. 2. in a I grinding :mill ;of. .the disk type 1-9. stationary :mill :stone, =a rrctatable :mill .stone, the

. .said mill .stones (being :provided :with la :eavity in theirladioining faces zanrl spaced from their 1 outer .edges, the vrotatable memberrhavingta pimrality off slotted openings extendingtthrough'ihe wall thereof, rpaddleelike ,pumping members :sub-

stantially radially positioned and circumferenvided with .a plurality of -V-shaped notches, a

portion .ofsaid notches beingadjacent said; pumping members to .facilitate entry of material 1 be,- tween the grindingsurfaces.

I B.'In a grinding mill'ofthe disk type, apair :o-r-mm stones 'havmg'an axially disposed cavity for receiving the material to "be ground, one .of

said" mill "stones being mounted for rotation and having "a plurality "of "radially spaced openings extending through thewv'all thereof and into the -'-cavity, paddle-like pumping members disposed within said openings, -said pumping-members being substantially radially positioned, circumferentially spaced and extending outwardly to'the periphery adf the a cavity; and means for adjust- -ably securingimeipumpingrmembers in-the open the material to be ground, means comprising notches in the inner marginal edge of each grind- 10 ing surface for facilitating entry of material between said surfaces, and paddle-like members extending through the rotatable mill stone and into the recess for pumping mate'riaihto be ground; into the notches, said paddle members being adjustably secured to said rotatable stone by T-bolts attached to said members and received within said stone;

MATT MACEK, SR. MATT MACEK, JR. 

